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檢索以下詞典:
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be an open book

be an open book
KNOW somethingto be something that you know and understand very well 非常熟悉的事物,是很了解的事物
 The natural world was an open book to him.
他对自然界了如指掌。
Examples from the Corpus
be an open book at open1(7)
be an open bookChinese

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